I have a custom line in my nginx-conf:
add_header X-Clacks-Overhead "GNU Terry Pratchett" always;
Since the (great) diagnostics came available with Yunohost 3.8, my hosts won’t automatically get their Lets Encrypt! certificates renewed, because the config of nginx is manually altered.
I know I can add configurations in the conf.d-directory, but I am not sure how to add a single line in this way. Is it possible? I am quite attached do the Clacks-Overhead